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For a helical antenna, the half-power beamwidth and directive gain are given by
where C = πD, N = L/S, and S = C tan α,in which α is called the pitch angle, and
The input impedance seen by the transmission line at point P is almost purely resistive, given by Za ∼ = 140C/λ. Calculate the antenna parameters of a 10-turn helix at f = 500 MHz by assuming that C = λ and α = 14π/180.
What is tunnel effect? Discuss the Alpha decay as an example of tunnel effect. Prove that tunneling increases on decreasing the height and width of the barrier. Explain what do you
Q. Show Block diagram of proportional and integral controller? The block diagram of Figure illustrates a typical microprocessor system used to implement the digital PI controll
Q. Define the spectral resolution of satellite? Spectral resolution : The sensitivity to different features of earth is the most important aspects considered in the spectral
Feedback amplifiers are of great importance in electronic circuits. The block diagram of a class of feedback amplifier is shown in Figure. Determine the transfer function C/R for t
Q. What is the procedure of Binary Subtraction? The Rules of Binary subtraction 0 - 0 = 0 0 - 1 = 1 , and borrow 1 from the next more significant bit 1 -
Explain SAR instructions in 8086 family with example and their effect on flag. SAR: Shift each bit of operand right through given number of bits, this instruction shifts eve
cite a specific example in which the engineer must provide maximum efficiency for a given cost.
Q. In an RLC series circuit excited by a voltage source v(t), for R = 10 , L = 1 H, and C = 0.1F, determine v(t) if the capacitor voltage vC(t) = 5e -10t V.
What is meant by polling? In polling schemes, a set of address lines is driven by the controller to address every of the masters in sequence. When a bus request is received fro
Q. Working of Equalizer circuit? Equalizer circuit: Equalizers are combination of passive components (capacitors, resistors and so on) that are used to regulate the amplitude a
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